1 and 8 dolls are poisonous? Yes Figure-8 dolls mostly refer to two-spotted puffer fish, which is a small ornamental puffer fish of teleost class. It is named after the gold thread on its back resembles the number 8. It is common in the estuaries of rivers in Southeast Asia, and its origin is Cambodia, Indonesia, Malaysia, Thailand and Vietnam. And it is highly toxic and must not be eaten.